N. Tonawanda, NY
I have 100's of flights on mine, and 4 crashes, no super direct hits to the head. The screws holding the arms loosened and the mr688 bearings take the knock, no other parts have needed to be replaced (yet). Based on what I have seen, the arms are the weak link, possible "protecting" the feathering shaft. It has a great clamping system to the main shaft, superior to the Align heads that keep the rotor head clamping in good shape. Watch the small screws holding the arms to the rotor head, clean well, use loc-tite and make sure the shorter of the two screws does not extend into the bore, putting pressure on the thrust bearing race.Stock mr688 bearings, even a light blade strike and at least one or two bearings will be notchy.